The training area does not intend to help you train yourself, but it lets you train Spamihilator. The spam-filter classifies mails he can't discriminate spam or non-spam as non-spam, for a decision is to make, and the safer decision for the user is surely non-spam.

colin1661music hat geschrieben:I would like to be able to search the deleted emails

I don't understand your question, because there are no deleted mails. In the training area and in the recycle bin you can use a search function (Edit, Quick find).